What does a horizontal line on a position-time graph indicate about the object? Possible answers
The object is accelerating.
The object has a position of zero.
The object remains still.
The object remains still.
A box is against a wall. A person pushes on the box, but the box does not move. Is this situation an example of a force?
No, this is not an example of a force because the box did not move.
Yes, this is an example of a force because a force is a push or pull.
No, this is not an example of a force because a force pulls an object.
Yes, this is an example of a force because a force is a push or pull.
When you trip, your foot stops, but your body continues to move forward. Which statement best explains why this happens?
The unbalanced force that stops your foot pulls your body forward.
An unbalanced force pushes your body forward.
An unbalanced force stops your foot but does not act on the rest of your body.
An unbalanced force stops your foot but does not act on the rest of your body.
Which option is the force with the greatest magnitude?
The force needed to lift a pencil
The force needed to lift a hairbrush
The force needed to lift a chair
The force needed to lift a chair
Which is a good description of kinetic energy?
Conserved energy
Energy of motion
Stored energy
Energy of motion
A person throws a ball up into the air. At which point in its path will the ball have the greatest potential energy?
When the ball is still rising
When the ball reaches its highest point
When the ball leaves the person’s hand
When the ball hits the ground
When the ball reaches its highest point
Use the image to answer the question.
This image of a roller coaster is designed to show important information about potential and kinetic energy. One of these pieces of information is incorrect. Which information is wrong, and why?
The roller coaster would only have kinetic energy at the point labeled “gravitational potential energy and kinetic energy.”
The spot with the “maximum kinetic energy” should be on the lowest point of the roller coaster, at the far left side on the bottom.
The roller coaster would only have potential energy at the point labeled “gravitational potential energy and kinetic energy.”
The spot with the “maximum kinetic energy” should be on the lowest point of the roller coaster, at the far left side on the bottom. (The lowest point of the coaster should be where the ball has the most kinetic energy and the least potential energy.)
Use the table of information from an investigation to answer the question.
Two students drop an object into sand from a height of 1.5 meters. They record the depth of the hole made in the sand by each student’s object. What is the most likely explanation for the results?
Maddie’s object has a smaller width.
Naveed’s object has less mass.
Naveed’s object had greater kinetic energy.
Naveed’s object had greater kinetic energy. (The deeper hole suggests that Naveed’s object had more energy upon impact, likely due to a combination of greater mass and greater speed.)
A student wants to determine the effect of mass on kinetic energy. She will drop two balls of the same size into a pool of water. Which investigation method should the student use?
She should drop two balls with different masses from different heights.
She should drop two balls with different masses from the same height.
She should drop two balls of the same mass from different heights.
She should drop two balls of the same mass from different heights. (Varying the mass would make it difficult to isolate the effect of mass on kinetic energy.)
Which statement explains how the charges on objects determine the electric force between them?
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1 point
Objects with positive charges attract each other, and objects with negative charges repel each other.
Objects with the same charge attract each other, and objects with opposite charges repel each other.
Objects with positive charges repel each other, and objects with negative charges attract each other.
Objects with the same charge repel each other, and objects with opposite charges attract each other.
Objects with the same charge repel each other, and objects with opposite charges attract each other.
Why is glass a good insulator?
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1 point
The atoms in glass hold on tightly to their negatively charged particles.
The atoms in glass hold on tightly to their positively charged particles.
The atoms in glass do not hold on tightly to their negatively charged particles.
The atoms in glass hold on tightly to their negatively charged particles.
Which statement describes a difference between insulators and conductors?
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1 point
Insulators have high resistance, while conductors have low resistance.
Insulators can transmit electric current, while conductors cannot.
Insulators have high conductivity, while conductors have low conductivity.
Insulators have high resistance, while conductors have low resistance.
Which energy transformation happens when a toaster is plugged in to an outlet in the wall and used to make toast?
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1 point
Electrical energy from the outlet is converted completely to heat energy for the toaster.
Electrical energy from the outlet is converted to heat and chemical energy in the toast.
Electrical energy from the outlet is converted to heat and light energy for the toaster.
Electrical energy from the outlet is converted to heat and light energy for the toaster.
Which purpose does a light bulb serve in a circuit?
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1 point
Cell
Switch
Load
Load
Of these things in an environment, which one is a living thing?
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1 point
air
river flowing down a mountain
mushrooms sprouting
clay on the side of the riverbank
mushrooms sprouting
One reason animal cells don't need a central vacuole is because they often have smaller vacuoles for storage. What is another reason animal cells don't need central vacuoles?
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1 point
Animals do not produce their own food.
Animal cells have cell walls.
Animal bodies have skeletons or other means of providing structure.
Animal bodies have skeletons or other means of providing structure.
Which statement is correct about organelles that provide energy?
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1 point
They are found only in animal cells.
They are responsible for cellular respiration.
They are found only in plant cells.
They are responsible for cellular respiration.
Unicellular cells must carry out ___ of life.
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1 point
all functions
a single function
specific functions
a few functions
all functions
What is the function of a nerve cell in a multicellular organism?
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1 point
produce and manage movement
store and distribute oxygen
carry and transmit signals
carry and transmit signals
Which system is most complex?
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1 point
cells
organs
organ systems
organ systems
Which statement is true?
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1 point
Bones help the heart pump blood.
Bones are composed of a single layer.
Bones provide shape to the body.
Bones are organ systems.
Bones provide shape to the body.
Which example shows an organism that cannot reach homeostasis through internal changes?
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1 point
A lizard is cold, and it moves to a sunny rock to warm up.
A dog shivers when it is too cold.
A person gets a fever in response to a flu infection.
A person gets a fever in response to a flu infection.
In which two organs is food broken down?
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1 point
Mouth and stomach
Small intestine and large intestine
Esophagus and small intestine
Esophagus and stomach
Mouth and stomach
When you experience changes in light, sound, and temperature, which cells send signals toward the central nervous system?
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1 point
dendrites
sensory neurons
axons
sensory neurons
Bacteria and humans are similar in that they
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1 point
are multicellular.
produce energy.
are unicellular.
grow and reproduce.
grow and reproduce.
Why is the classification species not considered a group?
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1 point
Each species is an individual organism.
Each species is a separate type of organism.
Each species shares characteristics with other species.
Each species is an individual organism.
Use the table model to correctly identify the animal in the story. You are walking home from school and an animal jumps out on the sidewalk. You can see it has a backbone, fur and is nibbling on some grass. As you get closer, you see that the animal is a....
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1 point
bird
cat
rabbit
dog
rabbit
Why are scientific names important to use?
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1 point
It is easier to pronounce than the common name.
That name is the same everywhere in the world.
The name is for animals that are only found in a specific location.
That name is the same everywhere in the world.
What should be the correct order (largest to smallest) of hierarchy for Classification of Organisms?
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1 point
class → order → family → genus → species
order → class → family → genus → species
species → genus → order → family → class